Is viagra ruining my drive?

Dear Deidre

I’m 22 and my girlfriend is only the second girl I’ve had sex with. I can get fully erect in foreplay and if I pleasure myself, but I’ve noticed I’m struggling to keep it up for any length of time recently.

My girlfriend thinks I should stop taking Viagra. Do you think it could be affecting my health or sex drive?

DEIDRE SAYS: A bad sexual experience can sometimes spoil future performances. But taking Viagra without the go-ahead from your GP is a bad idea.